3. MAINTENANCE
49
②
Valve spring free length
Measure the free length of the valve Springs. If out of the
standard or service limit. Please replace the spring.
Standard
Service limit
34.0mm
32.5mm
③
Valve guide
Inspect
：
a) Inspect the valve guide for smooth, scratch and damaged in the inner surface, and
matching between the valve guide and cylinder cover for
fastness.
b) Using the valve guide reamer, ream the valve guides to
remove any carbon deposits before measuring.
If the valve guide inside diameter is lower than standard
or out of the service limit, replace the guide.
Standard
Service Limit
5.500-5.512mm
5.562mm
Replacement
a)
Chill the replacement valve guides in the freezer section of a refrigerator for about an
hour.
b)
Drive the valve guide out of the combustion chamber side using valve guide driver.
VALVE
GUIDE
Reamer
